Updateable query error

I get this error:
operation must use an updateable query (line 43)

on this code:
...
'Create the INSERT statement for a brand new client.

SQLINSERT="INSERT INTO Clients (fname, lname, email, carID, tranID, gradeID) "
SQLINSERT=SQLINSERT & "VALUES ("
SQLINSERT=SQLINSERT & "'" & fname & "', "
SQLINSERT=SQLINSERT & "'" & lname & "', "
SQLINSERT=SQLINSERT & "'" & email & "', "
SQLINSERT=SQLINSERT & carID & ", "
SQLINSERT=SQLINSERT & tranID & ", "
SQLINSERT=SQLINSERT & gradeID & ") "

set connupdate = server.createobject("ADODB.Connection")
connupdate.open "DNS=parking"
connupdate.execute(SQLINSERT)
...

Where line 43 is:
connupdate.execute(SQLINSERT)

any clues? Clients is the table name, parking is the odbc datasource name, etc.

Do you have the permisions to perform this action??

S-

May be the database is not given Write permissions to all it's users.Check that out.If permission is not given , give write permissions to all.

SQLINSERT=SQLINSERT & carID & ", "
SQLINSERT=SQLINSERT & tranID & ", "
SQLINSERT=SQLINSERT & gradeID & ") "

are the above lines number fields?